Sewing fabric stitching auxiliary feeding device

Abstract

The utility model discloses a kind of sewing fabric sewing auxiliary feeding devices, solve the problem that uniform speed condition of cloth in the cloth feeding process in existing sewing machine needs to be improved.The device includes presser foot, pushing assembly and pulling assembly, wherein, pulling assembly is set in the front side of presser foot with the fixed mode of suspension and is provided with the first pressure wheel of initiative pulling to cloth;The pushing assembly is set in the rear side of presser foot with the fixed mode of suspension and is provided with the second pressure wheel of initiative pushing to cloth;The cloth is tensioned and fed at uniform speed under the action of the first pressure wheel and the second pressure wheel.By setting pushing assembly of sewing machine presser foot front end process to push actively, cooperate with pulling assembly set in the rear end of presser foot to pull actively, realize the uniform speed feeding of cloth, the pressure wheel specification and speed in two assemblies are equal, ensure the uniform speed when cloth passes through presser foot area.

Description

Technical Field

[0001] This utility model relates to the technical field of sewing auxiliary feeding devices, and in particular to a linear feeding device for sewing fabric. Background Technology

[0002] During fabric sewing, the sewing machine head and presser foot work together to temporarily compress and sew the fabric. During sewing, the fabric needs to be stretched to ensure even feed. The goal is to match the fabric feed speed with the sewing speed. Currently, there are two types of fabric feeding: manual feeding and dedicated feeding systems. Manual feeding relies on the worker's feel and skill, while dedicated feeding systems are designed and used to better ensure even stress on the fabric, preventing it from shifting and thus guaranteeing the straightness and quality of the stitches.

[0003] Different manufacturers have developed specialized feeding systems with different structures to address different usage scenarios. For example, N221721093U discloses a sewing machine with assisted feeding. The sewing machine body is fixedly connected to the top of the base plate. Support plates are fixedly connected to both the front and rear sides of the top right end of the base plate. A drive motor is fixedly connected to the front end of the support plate. A transmission rod is fixedly connected to the drive end of the drive motor. Multiple rotating rods are fixedly connected to both the front and rear ends of the transmission rod. A push plate is slidably connected to the side of the rotating rod away from the transmission rod. Feeding is achieved through the push plate. This feeding structure is intermittent, that is, the fabric is fed non-continuously. The push plate cannot achieve uniform feeding of the fabric, resulting in poor sewing quality. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a sewing fabric feeding auxiliary device to solve the problem of insufficient uniformity of fabric feeding during the existing sewing machine process.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: A sewing fabric auxiliary feeding device includes a presser foot, a pusher assembly, and a puller assembly. The puller assembly is suspended and fixedly positioned on the front side of the presser foot and equipped with a first pressure roller for actively pulling the fabric. The pusher assembly is suspended and fixedly positioned on the rear side of the presser foot and equipped with a second pressure roller for actively pushing the fabric. The fabric is tensioned and fed at a uniform speed under the action of the first and second pressure rollers.

[0006] Furthermore, the material pulling assembly includes a first bracket, a first connecting rod, a first motor, and a first pressure roller. The first bracket is movably connected to the first connecting rod via a joint shaft. The end of the first connecting rod is movably mounted with a pressure roller shaft, and the first pressure roller is fixedly mounted on the pressure roller shaft. The first motor is fixed on the first bracket and drives the first pressure roller to rotate actively through a two-stage synchronous belt drive. A first tension spring is set between the first bracket and the first connecting rod. Under the action of the first tension spring, the first pressure roller has a downward pressing tendency.

[0007] Furthermore, there are two No. 1 pressure rollers, one on the left and one on the right, arranged on both sides of the No. 1 connecting rod, with the center line of the gap between the two No. 1 pressure rollers aligned with the center line of the pressure foot.

[0008] Furthermore, an eccentric wheel is hinged to the first bracket, and an arc-shaped groove is provided on the first connecting rod. Rotating the eccentric wheel presses down on the rear end of the first connecting rod and causes it to deflect. During the deflection process, the tension spring is stretched, and the pressure wheel has an upward movement until the eccentric part of the eccentric wheel enters the arc-shaped groove.

[0009] Furthermore, an operating handle is provided on the first eccentric wheel, and the position of the first eccentric wheel can be changed by operating the handle.

[0010] Furthermore, the first bracket has a T-shaped outline, with a first mounting plate at the top, a first vertical plate below the first mounting plate, and a first inclined plate at the lower end of the first vertical plate that is inclined towards the pressure foot.

[0011] Furthermore, there are two pressure rollers, one on the left and one on the right, arranged on both sides of the second connecting rod, with the center line of the gap between the two pressure rollers aligned with the center line of the pressure foot.

[0012] Furthermore, a second eccentric wheel is hinged to the second bracket, and a second arc-shaped groove is provided on the second connecting rod. Rotating the second eccentric wheel presses down on the rear end of the second connecting rod and causes it to deflect. During the deflection process, the second tension spring is stretched, and the second pressure wheel has an upward movement until the eccentric part of the second eccentric wheel enters the second arc-shaped groove.

[0013] Furthermore, an operating handle is provided on the second eccentric wheel, through which the position of the eccentric wheel can be changed.

[0014] Furthermore, the second bracket has a T-shaped outline, with a second mounting plate at the top, a second vertical plate below the second mounting plate, and a second inclined plate at the lower end of the second vertical plate that is inclined towards the pressure foot.

[0015] The beneficial effects of this utility model are: This technological innovation achieves uniform fabric feeding by using a pusher assembly located at the front of the presser foot of the sewing machine to actively push the fabric, and a puller assembly located at the rear of the presser foot to actively pull it. The pressure rollers in the two assemblies have the same specifications and rotation speed, ensuring that the fabric passes through the presser foot area at a uniform speed. Combined with the sewing action of the sewing machine head, this achieves balanced force on the fabric, prevents fabric deviation, and ensures uniform straightness and quality of the stitching. Attached Figure Description

[0016] Figure 1 This is a side view of the device.

[0017] Figure 2 This is a top-down view of the device.

[0018] Figure 3 This is a 3D view of the material pulling assembly, showing a side and rear view.

[0019] Figure 4 This is a 3D view of the material pulling assembly, showing a frontal side view.

[0020] Figure 5 This is a 3D view of the pusher assembly, showing a side-rear perspective.

[0021] In the diagram: 100, Material pulling assembly; 110, Support No. 1; 111, Mounting Plate No. 1; 112, Vertical Plate No. 1; 113, Inclined Plate No. 1; 120, Connecting Rod No. 1; 121, Arc-shaped Slot No. 1; 130, Motor No. 1; 140, Pressure Roller No. 1; 150, Eccentric Wheel No. 1; 160, Tension Spring No. 1; 200, Material pushing assembly; 210, Support No. 2; 211, Mounting Plate No. 2; 212, Vertical Plate No. 2; 213, Inclined Plate No. 2; 220, Connecting Rod No. 2; 221, Arc-shaped Slot No. 2; 230, Motor No. 2; 240, Pressure Roller No. 2; 250, Eccentric Wheel No. 2; 260, Tension Spring No. 2; 300, Presser foot; 400, Fabric. Detailed Implementation

[0022] This embodiment is described in conjunction with the appendix to the instruction manual. Figure 1 To be continued Figure 5 A detailed description is provided of the auxiliary feeding device for sewing fabrics.

[0023] exist Figure 1 The device includes a pusher assembly 200 located behind the presser foot 300 of the sewing machine and a puller assembly 100 located in front of the presser foot 300. The pusher assembly 200 actively pushes the fabric 400 and works with the puller assembly 100 to take the fabric 400 back, achieving the goal of uniformly advancing the fabric 400 while maintaining a constant tension. During the uniform advance of the fabric 400, the sewing of the fabric 400 is achieved.

[0024] In this embodiment, the infeed direction of fabric 400 is set to the rear end, and the outfeed direction of fabric 400 is defined as the front end, referring to... Figure 1 and Figure 3 .

[0025] The structures of the pusher assembly 200 and the puller assembly 100 are described in detail below.

[0026] Material assembly 100, for reference Figure 3 and Figure 4 This assembly includes a first bracket 110, a first connecting rod 120, a first motor 130, and a first pressure roller 140. The first bracket 110 has a T-shaped profile, and the rectangular stainless steel plate at the top is the first mounting plate 111, used for suspended mounting of the pusher assembly 200. Below the first bracket 110 is a first vertical plate 112 facing downwards, and at the lower end of the first vertical plate 112 is a first inclined plate 113 folded back in the direction of the pressure foot 300. The first connecting rod 120 is hinged at the end of the first inclined plate 113 via a joint axis. A synchronous pulley is fixedly mounted on both sides of the aforementioned joint axis.

[0027] A pressure roller shaft is movably installed at the end of the aforementioned connecting rod 120. A synchronous pulley and two pressure rollers 140 are fixedly mounted on the pressure roller shaft, one on the left and one on the right, forming a gap between them. The center line of this gap is aligned with the center line of the presser foot 300. A synchronous belt drive is established between the pressure roller shaft and the aforementioned pulley shaft. In this embodiment, the two pressure rollers 140 press the lower end of the fabric 400.

[0028] The aforementioned first connecting rod 120 extends rearward at its rear end, and a tension spring mounting hole is provided at the rear end of the first connecting rod 120 to facilitate the installation of the first tension spring 160. A tension spring mounting hole is also provided on the vertical plate of the aforementioned first bracket 110 for installing the other end of the first tension spring 160. In this embodiment, the first connecting rod 120 is tightened by the first tension spring 160. Under the action of the first tension spring 160, the first pressure roller 140 at the front end of the first connecting rod 120 has a downward pressing tendency, and under this tendency, the fabric 400 is pressed tightly.

[0029] Furthermore, a first eccentric wheel 150 is hinged to the inclined plate of the first bracket 110. This first eccentric wheel 150 is mounted on the first inclined plate 113 via a steel pin or dowel, and an operating handle is provided on the first eccentric wheel 150 to change its position. Corresponding to the first eccentric wheel 150, a first arc-shaped groove 121 is provided on the first connecting rod 120. The arc of the first arc-shaped groove 121 is equivalent to the arc of the first eccentric wheel 150. Rotation of the first eccentric wheel 150 allows for... The first eccentric wheel 150 presses down on the first connecting rod 120 at the rear end, causing it to deflect. During the deflection, the first tension spring 160 is stretched, which lifts the first pressure wheel 140 and releases the fabric 400 below. The position of the first connecting rod 120 is fixed when the eccentric part of the first eccentric wheel 150 enters the first arc-shaped slot 121, so that the first pressure wheel 140 and the fabric 400 below maintain an appropriate distance. In this state, the fabric 400 can be replaced.

[0030] A first motor 130 is installed in the middle of the vertical plate of the first support 110. This first motor 130 is a miniature geared motor, and a synchronous pulley is installed on the first motor 130. A synchronous belt is set between the synchronous pulley and the synchronous pulley on the joint shaft to form a synchronous belt drive. In this embodiment, during the rotation of the first motor 130, it ultimately drives the first pressure roller 140 to rotate through the secondary synchronous belt drive. The direction of rotation is clockwise, which pulls the front end of the fabric 400 to form a tensile force.

[0031] Pusher assembly 200, for reference Figure 3 and Figure 4 This assembly includes a second bracket 210, a second connecting rod 220, a second motor 230, and a second pressure roller 240. The second bracket 210 has a T-shaped profile, and the rectangular stainless steel plate at the top is the second mounting plate 211, used for suspended mounting of the pusher assembly 200. Below the second bracket 210 is a downward-facing second vertical plate 212, and at the lower end of the second vertical plate 212 is a second inclined plate 213 that folds back in the direction of the pressure foot 300. The second connecting rod 220 is hinged at the end of the inclined plate via a joint shaft. A synchronous pulley is fixedly mounted on both sides of the aforementioned joint shaft.

[0032] A pressure roller shaft is movably installed at the end of the aforementioned second connecting rod 220. A synchronous pulley and two second pressure rollers 240 are fixedly mounted on the pressure roller shaft. The two second pressure rollers 240 are positioned on either side of the second connecting rod 220, forming a gap between them. The center line of this gap is aligned with the center line of the presser foot 300. A synchronous belt drive is established between the pressure roller shaft and the aforementioned pulley shaft. In this embodiment, the two second pressure rollers 240 press the lower end of the fabric 400.

[0033] The rear end of the aforementioned second connecting rod 220 extends rearward, and a tension spring mounting hole is provided at the rear end of the second connecting rod 220 to install the second tension spring 260. A tension spring mounting hole is provided on the vertical plate of the aforementioned second bracket 210 for installing the other end of the second tension spring 260. In this embodiment, the second connecting rod 220 is tightened by the second tension spring 260. Under the action of the second tension spring 260, the front end of the second connecting rod 220, the second pressure roller 240, has a downward pressing tendency, and under this tendency, the fabric 400 is pressed tightly.

[0034] Furthermore, a second eccentric wheel 250 is hinged to the inclined plate of the second bracket 210. This second eccentric wheel 250 is mounted on the second inclined plate 213 via a steel pin or dowel, and an operating handle is provided on the second eccentric wheel 250 to change its position. Corresponding to the second eccentric wheel 250, a second arc-shaped groove 221 is provided on the second connecting rod 220. The arc of the second arc-shaped groove 221 is equivalent to that of the second eccentric wheel 250. Rotation of the second eccentric wheel 250 allows for... The second eccentric wheel 250 presses down on the second connecting rod 220 at its rear end, causing it to deflect. During the deflection, the tension spring is stretched, which lifts the second pressure wheel 240, releasing the fabric 400 below. This continues until the eccentric part of the second eccentric wheel 250 enters the second arc-shaped slot 221, fixing the position of the second connecting rod 220 and maintaining an appropriate distance between the second pressure wheel 240 and the fabric 400 below. In this state, the fabric 400 can be replaced.

[0035] A second motor 230 is installed in the middle of the vertical plate of the second support 210. This second motor 230 is a micro geared motor, and a synchronous pulley is installed on the second motor 230. A synchronous belt is set between the synchronous pulley and the synchronous pulley on the joint shaft to form a synchronous belt drive. In this embodiment, during the rotation of the second motor 230, it ultimately drives the second pressure roller 240 to rotate through the secondary synchronous belt drive. The direction of rotation is counterclockwise, pushing the rear end of the fabric 400 to form a pushing force.

[0036] In this embodiment, the combined use of the two assemblies, through the pulling and pushing action of the presser foot 300 in the forward and backward strokes, ensures the uniformity of the fabric 400 as it passes through the presser foot 300, thus guaranteeing the quality of the sewing.

Claims

1. A sewing fabric auxiliary feeding device, comprising a presser foot (300), a pusher assembly (200), and a puller assembly (100), characterized in that: The material pulling assembly (100) is fixedly mounted in a suspended manner on the front side of the presser foot (300) and is equipped with a first pressure roller for actively pulling the fabric (400); the material pushing assembly (200) is fixedly mounted in a suspended manner on the rear side of the presser foot (300) and is equipped with a second pressure roller for actively pushing the fabric (400); the fabric (400) is tensioned and fed at a uniform speed under the action of the first and second pressure rollers.

2. The sewing fabric auxiliary feeding device according to claim 1, characterized in that, The material pulling assembly (100) includes a first bracket (110), a first connecting rod (120), a first motor (130), and a first pressure roller (140). The first bracket (110) is movably connected to the first connecting rod (120) via a joint shaft. The pressure roller shaft is movably installed at the end of the first connecting rod (120). The first pressure roller (140) is fixedly installed on the pressure roller shaft. The first motor (130) is fixed on the first bracket (110) and drives the first pressure roller (140) to rotate actively through a secondary synchronous belt drive. A first tension spring (160) is provided between the first bracket (110) and the first connecting rod (120). Under the action of the first tension spring (160), the first pressure roller (140) has a downward pressing tendency.

3. The sewing fabric auxiliary feeding device according to claim 2, characterized in that, The number of pressure rollers (140) is two, one on the left and one on the right, and the center line of the gap between the two pressure rollers (140) is aligned with the center line of the pressure foot (300).

4. The sewing fabric auxiliary feeding device according to claim 3, characterized in that, A first eccentric wheel (150) is hinged to the first bracket (110), and a first arc-shaped groove (121) is provided on the first connecting rod (120). Rotating the first eccentric wheel (150) presses the rear end of the first connecting rod (120) and causes it to deflect. During the deflection process, the first tension spring (160) is stretched until the eccentric part of the first eccentric wheel (150) enters the first arc-shaped groove (121).

5. The sewing fabric auxiliary feeding device according to claim 4, characterized in that, An operating handle is provided on the first eccentric wheel (150).

6. The sewing fabric auxiliary feeding device according to claim 5, characterized in that, The first bracket (110) has a T-shaped outline, with a first mounting plate (111) at the top, a first vertical plate (112) below the first mounting plate (111), and a first inclined plate (113) at the lower end of the first vertical plate (112) that is inclined toward the pressure foot (300).

7. The sewing fabric auxiliary feeding device according to claim 1, characterized in that, The number of the second pressure rollers (240) is two, one on the left and one on the right, and the center line of the gap between the two second pressure rollers (240) is aligned with the center line of the pressure foot (300).

8. The sewing fabric auxiliary feeding device according to claim 7, characterized in that, The second eccentric wheel (250) is hinged on the second bracket (210). The second arc-shaped groove (221) is provided on the second connecting rod (220). Rotating the second eccentric wheel (250) will press the rear end of the second connecting rod (220) and cause it to deflect. During the deflection process, the second tension spring (260) will be stretched until the eccentric part of the second eccentric wheel (250) enters the second arc-shaped groove (221).

9. The sewing fabric auxiliary feeding device according to claim 8, characterized in that, An operating handle is provided on the second eccentric wheel (250).

10. The sewing fabric auxiliary feeding device according to claim 9, characterized in that, The second bracket (210) has a T-shaped outline, with a second mounting plate (211) at the top, a second vertical plate (212) below the second mounting plate (211), and a second inclined plate (213) at the lower end of the second vertical plate (212) that is inclined toward the pressure foot (300).

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